166604403 has 32 divisors (see below), whose sum is σ = 275083776. Its totient is φ = 87510528.

The previous prime is 166604401. The next prime is 166604423. The reversal of 166604403 is 304406661.

It is not a de Polignac number, because 166604403 - 2¹ = 166604401 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166604401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9925 + ... + 20777.

It is an arithmetic number, because the mean of its divisors is an integer number (8596368).

Almost surely, 2^166604403 is an apocalyptic number.

166604403 is a deficient number, since it is larger than the sum of its proper divisors (108479373).

166604403 is a wasteful number, since it uses less digits than its factorization.

166604403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10923.

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 166604403 is about 12907.5328006556. The cubic root of 166604403 is about 550.2526695809.

The spelling of 166604403 in words is "one hundred sixty-six million, six hundred four thousand, four hundred three".